Here are some pictures of my pre-amp which I have partially completed. The main control amp is based on an LM4562 single ended to balanced design with a gain of approx 3. All inputs are relay switched with control via a swtich located on the LHS of the front panel. I use an Alps Blue Velvet pot (10k - I also like lowish value potentiometers - and with a bipolar input op-amp, this gives better noise performance). For the power supply, I used an Amveco transformer (very low mechanical noise and much better I discovered than the Block transformer brand in this regard). Main supply is built around LM317/337. Each op-amp supply is further decoupled with a 22 Ohm and 100uF. In series with each balanced output, I have 50 ohms to isolate cable capacitances .

The pre-amp input to output is DC coupled, but no servo is necessary.

For the headphone amp, I am driving a diamond buffer stage straight from the pre-amp output stage, so no gain. I have used capacitive coupling on the output of the headphone amp.

I've mounted the phono board, but its not yet complete - I still have to get some parts - its based heavily on Dennis Collin's design out of Audio Amateur. On each input, I have a 10 way DIL switch for selectable cartridge loading. The supply lines on the op-amps on the phono card are also decoupled with 22 ohms and 100uF.

I am playing it through my power amp and driving a pair of B&W 703's and I must say the sound to my ears is very good - clean, open with great bass. I listen mainly to jazz, classical and light rock.

Originally posted by Bonsai Internal shot of the main amp and regulator board.

First class parts inside!
Cornell-Doubilier silver mica caps, Panasonic (blue=low ESR) electrolytics etc... resistors are Vishay?
In the front, the 4 small yellow parts are NAIS relays? Or Panasonic? What type are you using?